The (15 Minute) Belly Blasting Workout

The Sprinter

Lie on your back with your arms at your sides, legs straight, and heels hovering six to 12 inches off the floor. As you sit up, lift and bend your left elbow, and pull your right knee to your chest, as if you were sprinting. Return to the starting position, keeping your legs raised, and repeat with the opposite arm and leg. That's one rep. Do 10 to 12.